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AWE Tuning Foiler Wind Diffuser

Reviews Views Date of last review
1 3521 Sat July 9, 2016


Recommended By Average Price Average Rating
100% of reviewers $85.00 10.0



As far as modifications go, this one surely has to be one of the easiest to accomplish.  I was left with so much extra time on my hands that I decided to shoot some video as well.  The process was so short that while I took a picture of the time on my sport chrono clock to show the start time, it was over so fast that I didn't think taking an end time shot was even relevant.   Yes, really it's that easy.

So what does this part do?  It stops that annoying cavitation effect that you get when you roll only one window down, in this case on a 981 Cayman GT4 but it is applicable to several new Porsches (see AWE's website for a complete list - link below).  What happens is that when you roll the window down the pressure differential between the outside air and the inside of the cabin causes a resonance or pulsing of the pressures as they try to equalize that is downright annoying to the ear drums.  There are a couple of ways you can alleviate or greatly diminish this effect and the method employed by the AWE Tuning Foiler is to disrupt the airflow over the side window and break up the pattern that causes the annoying sounds.

Although I did capture video of the pulsing effect prior to installing the AWE parts I found it difficult to capture on video as I suspect microphones are tuned to cancel out some of these effects naturally whereas our ear drums cannot.  I certainly spent more time trying to capture it on video than I did actually installing the product.  I am still going to shoot some additional post-install video and will update this article again after I upload that video to YouTube.   In the mean time here is the install and pre-install video.


Here is a picture of the box with the two parts, associated install hardware, and a sucker.  I'm assuming the sucker is there to give you something to do while you do the install.  Like the commercials of old, I don't think you are going to reach the center before the install is done unless you end up biting the sucker.


The first step is to use a plastic pry tool to pop off the cover on the inside door panel as show in this next picture:

Once that cap is popped off you can reach the single screw hidden behind it.  Using a torx bit T-15 driver I removed the screw which allows you to remove the outer plastic piece that you need to replace with the new Foiler piece.  You remove it by pulling upwards at an angle because the piece is held in by a clip near the top.  The clip can be seen on the backside of the factory and foiler piece in an image further down in this article.  The image below shows the factory piece and removed screw next to the new foiler piece.

Next all you have to do is turn over the foiler piece and attach the black plastic adapter arm to the backside of the piece using a screw provided in the kit.  The new kits have this adapter arm keyed to only go on one way, in other words making it as easy as possible to get it right the first time.  This next image shows the black plastic adapter and the peg that it goes on and how the hole in the adapter arm is actually a square so the arm will only go on a certain way and not rotate around

Before you attach the black plastic arm to the main body of the foiler I strongly suggest that you take the long screw that you removed from the original factory piece in the first step above and run that screw through the round opening end of the black plastic arm.   This accomplishes two things, first it threads the plastic hole without applying any force on any other parts, and second it allows you to make sure you have a straight threading of the screw since you won't be able to see the screw engage this part once you go on to the install steps below.   Here is a picture of the screw threaded through the black plastic arm.

Next you simply place the black plastic arm on top of the keyed peg on the back side of the main folier piece as shown in the following photo.   Note that this is the position that the arm should rest it and it should not be able to rotate around because the opening in the arm is keyed square to match the square peg.

Next simply tighten the small Torx T-15 screw provided by AWE in the hardware bag of the kit to tighten the black arm down onto the peg as shown in the following image.

The next image shows the adapter arm installed with the provided small screw.  You will repeat this process for both sides.  Once the black adapter arm is in place you are ready to install the new foiler diffuser assembly back on the car.  Note the retaining clip on the new piece that is very similar to the one on the original piece at the top, it is that clip that you will slide over the tab located on the outside of the car near the top of the black triangle.

The adapter arm positions the receiving hole for the main screw to the same location as the original part.   If you overlay one part on top of the other it becomes very obvious.  The next step is to simply slide the new foiler piece onto the retaining clip on the outside of the car in a reversal of how you previously removed it.  Once the piece has been pushed down on the retaining clip and the main screw reinstalled from the inside of the car you can then pop the inside retaining cap back into place and you are done.   Here is what the finished piece looks like:

At this point you only need to repeat the same process on the passenger side of the car (in my case I started with driver side first) and that will take you even less time that the first side that you install.   Next go out and drive and try rolling one window down or the other or both and listen for an improvement and very noticeable reduction in the amount of unpleasant buffeting and cavitation.

Post Install Video Can be found here:

Additional install photos can be found in our Gallery Here:


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Keywords: foiler diffuser wind noise cavitation buffet



Site Upgrade Donor

Registered: September 2009
Location: AL
Posts: 1115
Review Date: Sat July 9, 2016 Would you recommend the product? Yes | Price you paid?: $85.00 | Rating: 10 
Pros: It really is that easy
Cons: instructions a little confusing
Have you installed this Product or Mod?: Yes

I got an earlier version and the adapter position wasn't totally clear, but easy enough to figure out, and I too was finished almost before I started!  I saved my sucker for later though.

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